PHP：AJAX 请求出现 500 内部服务器错误答案

【问题标题】：PHP: 500 Internal Server Error on AJAX requestPHP：AJAX 请求出现 500 内部服务器错误
【发布时间】：2017-11-25 09:53:49
【问题描述】：

我有一个 bdd MySQL，它会定期更新人工智能生成的文本。我想将这个无限文本显示为网络发布，所以我们这样做了，作为一个粗略的测试：

<head>
    <script type = "text/javascript" src = "https://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
</head>
<body>
    <div id="myTable"></div>

    <script type="text/javascript">  
        function page_refresh() {
            $.ajax({
                url: 'getData.php',
                type: 'GET',
                success: function(data) { 
                    $('#myTable').html(data);
                },
                error: function(request,error) {
                    alert("Request error: " + JSON.stringify(request));
                }
            });
        }

        var period = 10000; // NOTE: period is passed in milliseconds
        setInterval(page_refresh, period); 
    </script>
</body>

谁在打电话getData.php

<?php

$dbhandle = new PDO("mysql:host='localhost';dbname='writing'", "root", "*********");  //this connects to your mysql table
$sql = "SELECT text, id, date FROM table_02 ;"; //this is your query, where you select what data you want from the table
$query = $dbhandle->prepare($sql); 

if ($query->execute() == FALSE) {
    die("Query error: " . implode($query->errorInfo(), ' '));
} //this is a measure to close the connection if there is an error

echo('<table>');
echo('<tr><th>id</th><th>date</th><th>text</th></tr>');

while ($row = $query->fetch()) {
    echo('<tr>');
    echo('<td>').$row ['id'].'</td>');
    echo('<td>').$row ['date'].'</td>');
    echo('<td>').$row ['text'].'</td>');
    echo('</tr>');
}

echo('</table>');

我们遇到了两个问题。首先，我们只得到一个空白页。其次，在一两秒后，我们得到了这个错误信息：

{Request error : "readyState":4,"responseText":"","status":500,"statusText":"Internal Server Error"}

有什么想法吗？

我的错误日志

> [Thu Jun 22 06:25:01.645901 2017] [mpm_prefork:notice] [pid 17562]
> AH00163: Apache/2.4.18 (Ubuntu) configured -- resuming normal
> operations [Thu Jun 22 06:25:01.645918 2017] [core:notice] [pid 17562]
> AH00094: Command line: '/usr/sbin/apache2' [Thu Jun 22 08:12:32.453382
> 2017] [:error] [pid 19559] [client 77.198.111.62:57256] PHP Parse
> error:  syntax error, unexpected ')', expecting ',' or ';' in
> /var/www/html/getData.php on line 14, referer:
> http://82.223.18.239/testTom.php [Thu Jun 22 08:21:09.579406 2017]
> [:error] [pid 19560] [client 77.198.111.62:57430] PHP Parse error: 
> syntax error, unexpected ')', expecting ',' or ';' in
> /var/www/html/getData.php on line 14, referer:
> http://82.223.18.239/testTom.php [Thu Jun 22 08:21:09.582093 2017]
> [:error] [pid 19648] [client 77.198.111.62:57431] PHP Parse error: 
> syntax error, unexpected ')', expecting ',' or ';' in
> /var/www/html/getData.php on line 14, referer:
> http://82.223.18.239/testTom.php [Thu Jun 22 09:09:04.947344 2017]
> [:error] [pid 19559] [client 77.198.111.62:59193] PHP Parse error: 
> syntax error, unexpected ')', expecting ',' or ';' in
> /var/www/html/getData.php on line 14, referer:
> http://82.223.18.239/testTom.php [Thu Jun 22 09:09:11.454622 2017]
> [:error] [pid 19648] [client 77.198.111.62:59196] PHP Parse error: 
> syntax error, unexpected ')', expecting ',' or ';' in
> /var/www/html/getData.php on line 14 [Thu Jun 22 09:10:28.529637 2017]
> [:error] [pid 19561] [client 77.198.111.62:59227] PHP Parse error: 
> syntax error, unexpected ')', expecting ',' or ';' in
> /var/www/html/getData.php on line 14 [Thu Jun 22 09:10:32.709239 2017]
> [:error] [pid 19558] [client 77.198.111.62:59229] PHP Parse error: 
> syntax error, unexpected ')', expecting ',' or ';' in
> /var/www/html/getData.php on line 14 [Thu Jun 22 09:11:39.122539 2017]
> [:error] [pid 19559] [client 77.198.111.62:59270] PHP Parse error: 
> syntax error, unexpected ')', expecting ',' or ';' in
> /var/www/html/getData.php on line 13, referer:
> http://82.223.18.239/testTom.php [Thu Jun 22 09:11:51.476161 2017]
> [:error] [pid 19648] [client 77.198.111.62:59285] PHP Parse error: 
> syntax error, unexpected ')', expecting ',' or ';' in
> /var/www/html/getData.php on line 13, referer:
> http://82.223.18.239/testTom.php [Thu Jun 22 09:14:14.697094 2017]
> [:error] [pid 19557] [client 77.198.111.62:59440] PHP Parse error: 
> syntax error, unexpected ')', expecting ',' or ';' in
> /var/www/html/getData.php on line 13, referer:
> http://82.223.18.239/testTom.php

听从你的建议，我现在：

<!DOCTYPE html>
<head>

<script type = "text/javascript" src = "https://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>

</head>

<body>
    <div id="myTable"></div>

    <script type="text/javascript">  
        function page_refresh() {
            $.ajax({
                url : 'getData.php',
                type : 'GET',
                success : function(data) { 
                    $('#myTable').html(data);
                },
                error : function(request,error)
                {
                    alert("Request error : "+JSON.stringify(request));
                }
            });
        }

        var period = 10000; //NOTE: period is passed in milliseconds
        setInterval(page_refresh, period); 
    </script>

</body>

至于 getData.php ：

<?php
$dbhandle = new PDO("mysql:host=localhost;dbname=writing", "root", "*********");//this connects to your mysql table
$sql = "SELECT text, id, date FROM table_02 ;"; //thise is your query, where you select what data you want from the table
$query = $dbhandle->prepare($sql); 

if ($query->execute() == FALSE)
    { die("Query error: " . implode($query->errorInfo(), ' ')); } //this is a measure to close the connection if there is an error

    echo('<table>');
        echo('<tr><th>le nom de la rose</th></tr>');
        while ($row = $query->fetch()) {
            echo('<tr>');
                ##echo('<td>'.$row ['id'].'</td>');
                ##echo('<td>'.$row ['date'].'</td>');
                echo('<td>'.$row ['text'].'</td>');
            echo('</tr>');
        }
    echo('</table>');
?>

它正在工作！使用此代码，页面每 X 秒刷新一次，但似乎一点也不流畅。如果我将它设置为每 100 毫秒刷新一次，它会像 F5 一样工作和卡顿。你知道如何解决吗？如何设置平滑刷新？有没有更有趣的方式在这里使用 ajax？

【问题讨论】：

检查错误日志-getData.php可能有错误
implode($query->errorInfo(), ' ') 是错误的。它的第一个参数应该是胶水和第二个数组
来自 PHP 手册 - Note: implode() can, for historical reasons, accept its parameters in either order. For consistency with explode(), however, it may be less confusing to use the documented order of arguments.
检查你的 http 服务器的错误日志，如果是 Apache 他们通常住在/var/log/apache2/error.log。
请不要从您的问题中删除代码并替换为问题已解决。而是考虑将其中一个答案标记为已接受或发布包含修复的自我答案。

标签： javascript php mysql ajax pdo

【解决方案1】：

您的连接不应在...中包含引号

$dbhandle = new PDO("mysql:host='localhost';dbname='writing'", "root", "*********");  //this connects to your mysql table

应该是……

$dbhandle = new PDO("mysql:host=localhost;dbname=writing", "root", "*********");  //this connects to your mysql table

【讨论】：

谢谢！我改变了这个，我得到了 apache 错误日志。我仍然得到一个空白页，但我们可能已经修复了一个错误:)
您的台词...echo('<td>').$row ['id'].'</td>'); 您需要删除第一个关闭 ')`。这是几行，所以检查一下。
喜欢吗？ echo(''$row ['id'].'');对不起，我在这里缺乏技能^^
它需要类似于echo('<td>'.$row ['id'].'</td>');

【解决方案2】：

您的代码有一些错误，请看下面的代码：

<?php

$dbhandle = new PDO("mysql:host=localhost;dbname=writing", "root", "*********");  //this connects to your mysql table
$sql = "SELECT text, id, date FROM table_02 ;"; //this is your query, where you select what data you want from the table
$query = $dbhandle->prepare($sql); 

if ($query->execute() == FALSE) {
    die("Query error: " . implode(' ', $query->errorInfo()));
} //this is a measure to close the connection if there is an error

echo '<table>';
echo '<tr><th>id</th><th>date</th><th>text</th></tr>';

while ($row = $query->fetch()) {
    echo '<tr>';
    echo '<td>', $row ['id'], '</td>';
    echo '<td>', $row ['date'], '</td>';
    echo '<td>', $row ['text'], '</td>';
    echo '</tr>';
}

echo '</table>';

顺便看看我写的echo s的风格，这叫做echo multiple parameters，比和.串联更好

【讨论】：